Superheater of water-tube boilers



Sept. I5. 1925.

i 1,554,154 H. E. YARRow x SUP-ERHEATER 01 WATER TUBE BOILHS Filed Feb. 10, 1920 wenw. ,/Yrol'fyW/vz vented certain new and water tube boilers and more Patented Sept. 15, 1925.

UNITEDSTATES PATENT OFFICE.

HAROLD E. YARROW, 0F SCOTSTOUN, SCTLAND.

- surnanmzma or WATERLTUBE Bomans.

Application llled Tebruary 10, 1920. -Serial No. 357,590.

l5 are placed between two nests of generating tubes they are not ve accessible for repairs or cleaning, an if they are disposed on the side of the nests of water tubes farthest from the source -of heat there is not sutlicientheat left in the furnace gases to obtain the highfdegree of superheat now generally required.

According .to `na1ned drawback is obviated by the provi- ""sion ofadditional oil burners in the4 space `between the generating and superheating tubes.

These burners are directed toward the generating tubes and away from the super- 2 heater so that shouldl the additional burners'` alone be alight at any time suilicient steam will be ,generated to cool the superheater, and this without resorting to the compli-l cation of an additional generating'element 4 located beyond the superheater.

'In some cases it may be` dvisable to distribute the oil burners over the length of the boiler so as to distribute the heat evenly over the ,whole length of the s u erheater tubes.` The small amount of additional brickwork required with this arrangement is `fixed to the end plates `of the'boiler or lies on the @12' lthe underneath side of'either horizontal o1'. i

cotland, have inthe invention,` the last-1 inclined surfaces, should the holding bolts burn awa-yor break the brickwork will ref main in position by its own weight.

The accompanying drawing represents diagrammatically an arrangement of superheaters according-to the invention.

A is the steam and water drum, B are the water drums C', C2 are nests of generating tubes; the superheater tubes are shown (at D. .E is one of a row of oil sprayers or burners, F an air box surrounding the sprayer, G an air distributor for the oil sprayer. These oil 'burners are inclined away from the superheater tubes D and are directed towards the generating tubes C2 for the urpose'stat'ed above. L I

A though in the example shown the superheater tubes are placed on one side only of the boiler, they may be provided on both sides of the boiler.

Having thus fully described the nature of the said invention and the best lmanner I know of carrying the same into practical .I

effect, I claim v:- l v A water tube boiler comprising two uptubes, a main combustion chamber straddled by the saidssets of generating tubes, two uptakes beyond the res ective sets of generating tubes and divide by a longitudinal partition, a steam superheater in one of the said uptakes located beyond the adjacent vset of generatin ytubes, an auxiliary combustion chamber.` etween the said superheater andV generating tubes,` and liquid fuel burners dischargin into the said auxiliary'combustion cham er and each comprising a fuel nozzle, air distributer and air box all con,- oentrically arranged with their common axis directed towards the adjacent set of steam generating tubes substantially as described. In testimony whereof I have signed my name to this specification. l

HAROLD YARRoW;

70 wardly converging sets of steam generating i 

